Ball-grinding machine.



E.HANUS. BALL GRINDING MACHINE.

APPLICATION FILED SEPT. 8, I916.

Patented Nov. 21, 1916.

- sidingat No-14 Treskows'trass'e, Tegel, near D STATES ll @FEBWQE.

EWAIJD HANUS, 0F 'IEGEL, NEAR BERLIN, GERMANY.

f Sp f fi Letters nt Patented Nov. 21,1916;

ToraZZ whom it may QOncem;

- Be i wn that-I, Ewano Halters, en gineer, subject of theKing of Prussia, re

Berlin, Germany,;have invented certain new. and useful Improvements in B llrGlfinding Machines, fication.

, The present invention relates to an iinprovementvin ball grinding machines of.

the type described in my United States Letters PatentNo. 1,124,018, in which machines there is interposed, between two plates '1 formed .with annulari grooves, a third or centralplate having groovesj'on both sides I thereof, this third plate being mounted stationarily and being formed with-an am'al charging recesse'xtending entirely through the plate. .In the constructional form of the machine disclosed in the said patent this, central plate consists of. two symmetrically arranged separate plates which are held together, by means of a casing section specially ormed for that: purpose" For a ball grindingmachine of the design described ,.to work satisfactorily it is necessary that theoperatifig parts, and in'particular the plates, are machined absolutely T' concentrically, and also that they have been assembled absolutely concentrically. It'is, obviously, very difficulttomeet both these conditions, and fill is, in particulandifficult, to machine the plates and their grooves'on a lathe so accurately that they run absolutely true, relatively to each other. Furthermore the absolute correspondence between the grooves will be easily disturbedby slight displacements from the centerjcaused in assembling q lhe smallest inaccuracy in this 40 regard will, .how'ever, have aeat detri mentalae'fiectonthe accurate-s ape of the;

ballszground, inasmuch as plates which are not absolutely concentric, cannot possibly produce,5when vworn,

an absolutelyspherical form-ofball m,

.- It islthe object of theg present invention to obviate this; idiific ulty, and effect v the two separate plates composing the centrall-grinding l teau-made in such a man men that they may adj 11St; themselyes' both radially and axially in accordance any possible inaccuracies intheconcentricity of the grooves, such arrangement ,the ace curate working of the machine, and 1n par? ticular the absolutelyg true; and spherical sh pej f the ba slg qund thereonfare';

aaL -enntnmre as irants filed September a, ieie. 7 serial radiance.

of which the following is a specishown is that the two separate hopper (i, which NAGHINE.

automatically assume the correct operating position, even in case they are not accu-- rately machined or not accurately assembled.

' sured, as the plates with their grooves will In the accompanying" drawing the present invention is forml in vertical cross section and partly in elevatioii; Fig. 2 is aside elevation-with the v ad}acjent grooved plate partly broken away.

exemplified a constructional Figure 1 is a view of the machine," partly:

The essential feature of the construction a and]? are not dependent orthcir arrangement upon the use of a cas ng'cover',

plate sections which latter" in this instance may be dis-' pensed with, 'butare disposed on opposite sides of arigid partition .9 and are supported at their lowest in a radial direction, themselves absolutely on the other hand, this may become necessary.- To providefor bottom of the tion 1', so as to pendulum thereon, said plates having a certain amount of play as indicated at y to permit such rocking movement.

The partition .5- is preferably made in one piece with the casing section r, and is formed with holes t "close to'its periphery, which holes are adapted -to' receive springs u.

and b, respectively,

are yieldingly' held against the rotating outer plates; For checln'ng the radial oscil lations-flat springs may be provided at theupperedges '02:, w" of the! casing, which springs will bearfagain'st the periphery of the plates a,' b and'tendto' overcome th 105 .JThem'achine is provided with a chargr'uig I is" constituted by a recess? jerky sidewise oscillations of "said plates.

or opening having a gable-shaped bottom, asin my earlier or patented construction, this opening or recess extending through the w p atesia an I nd t e part s asshown. a

point in such a manner that" they can, on the onejhand, oscillate slightly and therefore adjust concentrically, and, shift axially, as far-"as '95 These springs are introduced under tension andbear at their ends against the plates a so that the said plates I claim:

1. In a ball-grinding machine, the combination of a. pair of rotatable grinding plates arranged in spaced, parallel relation to each other and having their inner faces formed with annular grooves; a pair of relatively stationary grinding plates fitting loosely in the space between the rotatable plates, and likewise arranged in spaced, parallel relation to each other, said stationary plates having their outer ifaces formed'with 'annular grooves registering with the firstnamed grooves; a stationarypartition'plate fitting in the space between the stationary grinding plates; and resilient means for pressing said stationary plates against said rotatable grinding plates.

2. In a ball-grinding machine, the combination of a pair of grinding plates arranged in spaced, parallel relation to each other and having their inner faces formed with annular grooves; a pair of relatively stationary grinding plates fitting looselyin the space between the rotatable plates, and likewise arranged in spaced, parallel relation to each other, said stationary plates having their outer faces formed with annular grooves registering with the first named grooves; a stationary partition plate fitting within the space between the stationary grinding plates, and formed with a plurality of transverse, opened, apertures; and

springs disposed in the said apertures and hearing at opposite ends against the inner faces of said stationary grinding plates, to yieldingly press the latter against said rotat-able grinding plates.

3. In a ball-grinding machine, the combination of a pair of rotatable grinding plates arranged in spaced, parallel relation to each other andihaving their inner faces formed with annular grooves; a pair of relatively stationary grinding plates fitting loosely in the space between the rotatable plates, and likewise arranged in spaced, parallel relation to each other, said stationary plates having their outer faces formed with annular grooves-registering with the first-named grooves; a stationary partition plate fitting-in the space between the stationary grinding plates; and resilient means for pressing said stationary grinding plates against said rotatabl grinding plates; said machine having a charging recess which is formed jointly in said stationary grinding plates and said partition plates and which" has a width equal to the combined thicknessof said plates.

4. In a ball-grinding machine, the combination of a pair of rotatable grinding plates arranged inspaced, parallel relation to each other and having their inner faces formed with annular grooves; and a relatively-stationary grinding plate fitting in the space between said rotatable plates and comprising a p-airof counter-part plate-like members having a limited yielding movement both axially and radially; said members having their outer faces formed with annular grooves registering with the first-named grooves.

5. In a ball-grinding machine, the combination of a pair of rotatable grinding plates arranged in spaced, parallel relation to each other and having their'inner faces formed with annular grooves; "a pair of relativelystationarygrinding platesfitting loosely in the space between the rotatable grinding plates and likewise arranged in spaced, parallel relation to each other; said stationary grinding plates having their outer faces formed with annular grooves registering with the first-named grooves, and also having a limited yielding movement both axially and radially; and a stationary parti tion plate fitting in the space between the stationary grinding plates.

6. In a ball-grinding machine, the combination of a pair of rotatable grinding plates arranged in spaced, parallel relation to each other; a pair of relatively-stationary grinding plates interposed between the rotatable grinding plates; and a bearing member on "which the stationary grinding plates rest at their lower portions, and'about which they are adapted to rock.

7. In a ball-grinding machine, the comare adapted to rock.

' 8. In a ball-grinding machine, the combination of a pair. of rotatable grinding plates arranged in spaced, parallel relation to each other; a pair of relatively stationary grinding plates interposed between the rotatable grinding plates and likewise arranged in spaced, parallel relation to each other; a

' stationary partition plate fitting in the space between said stationary grinding plates; and a bearing member on which the stationary grinding plates rest at their lower portions, and about which they are adapted to rock, said bearing member disposed beneath said partition plate and extending on opposite sides" thereof. 7

'9; In a ball-grinding machine, the combination of a pair of rotatable grinding plates arranged in spaced, parallel relation to each other; a pair of relatively-stationary grinding plates interposed between the rotatable grinding plates; resilient means for press ing said stationary grinding plates against said rotatable grinding plates; and a beara plurality of transverse, open-ended apertures; springs disposed in said apertures and bearing at opposite ends against the inner faces of said stationary grinding plates, to yieldingly press the latter against the rotatable grinding plates; and a hearing member on which the stationary grinding plates rest at their lower portions, and about which they are adapted to rock.

11. In a ball-grinding machine, the combination of a pair of rotatable grinding plates arranged in spaced, parallel relation to each other and having their inner faces formed with annular grooves; a pair of relatively-stationary grinding plates fitting in the space between the rotatable grinding plates and having their outer faces formed with annular grooves registering with the first-named grooves; and resilient means interposed between the stationary plates for yieldingly pressing them laterally against said rotatable grinding plates.

12. In a ball-grinding machine, the combination of a pair of rotatable grinding plates arranged in spaced, parallel relation to each other and having their inner faces formed with annular grooves; a pair of relatively-stationary grinding plates fitting in the space between the rotatable grinding plates and having their outer faces formed with annular grooves registering with the first-named grooves; resilient means interposed between the stationary plates for yieldingly pressing them laterally against said rotatable grinding plates; and a. bearing member upon which said stationary grinding plates rest at their lower portions, and

about which they are adapted to rock.

13. In a ball-grinding machine, the combination of a pair of rotatable grinding plates arranged in spaced, parallel relation to each other; a pair of relatively-stationary grinding plates interposed between the rotatable grinding plates and provided with transverse peripheral recesses at their bottom portions; a transversely-disposed bar fitting in said recesses and constituting a bearing about which said stationary grinding plates are adapted to rock; and resilient means interposed. between the stationary grinding plates for yieldingly pressing them laiterally against said rotatable grlnding p ates.

In testimony wherof I aflix my signature.

EWALD HANUS.

In presence of' HENRY HASPER, A LLEN F. JENNINGS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

